Which statement about B-lymphocytes and T-lymphocytes is correct?
1 )
They become active only when a specific antibody binds to their surface receptor.
2 )
They divide to form clones when meeting an antitoxin in a cell.
They produce memory cells to respond to an antigen when exposed in the future.
4 )
They release hormone-like cytokines which stimulate release of antibodies.
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